Karmayogi (1978)

Brash, outspoken, and aethiest Shanker lives in a small village with his son, Mohan, and his devout wife, Durga, who is expecting another child soon. One day Shanker decides to leave and takes Mohan with him, leaving a pregnant Durga alone. Years go by, both Mohan and Ajay have grown up. Mohan and Shanker operate a crime syndicate, partnering with Keshavlal, a notorious gangster. Ajay operates a publicatin called Karmayogi, in which he publishes news and information about crime and criminals, and does an expose on Keshavlal. Mohan and Shanker want a bigger stake in the share, which Keshav agrees to, but arranges for Shanker to get killed, and blames it on Ajay. When Shanker is killed, Mohan swears to avenge his father's death and begins the trek of locating and killing Ajay.